Weeds vs. Invasive weeds

A weed is any unwanted plant that interferes with the management
objectives for a particular site, whereas an invasive weed is one that
has, or will have, a substantial negative impact on the environment or
the economy. Invasive weeds are typically not indigenous to the United
States, and in some cases, have taken over large tracts of pasture and
rangeland in states like Utah, Colorado, and California.